stream: don't send STREAM_START multiple times

src/stream-tcp-reassemble.c

@@ -1090,9 +1090,9 @@ static int ReassembleUpdateAppLayer (ThreadVars *tv,
     const uint8_t *mydata;
     uint32_t mydata_len;
     bool gap_ahead = false;
-    const uint8_t flags = StreamGetAppLayerFlags(ssn, *stream, p);
 
     while (1) {
+        const uint8_t flags = StreamGetAppLayerFlags(ssn, *stream, p);
         bool check_for_gap_ahead = ((*stream)->data_required > 0);
         gap_ahead = GetAppBuffer(*stream, &mydata, &mydata_len,
                 app_progress, check_for_gap_ahead);